Fire-alarm device



Oct. 12 1926.

Y W. C. BROOKS FIRE ALARM DEVICE Filed Sept. 10. 1925 ii? mlw Patented Oct. 12, 1926.

UNITED STATES PATENT OFFICE.

FIRE-ALARM DEVICE.

Application filed September 10, 1925.

This invention relates to improvements in fire alarm devices,one object of the invention being to provide a simple device which may be readily supported in any position in or about a building and operable by heat caused by fire in proximity to the device to cause explosion of a charge and the emission of a loud blast incident to such explosion.

A further object is to so construct the device that the result of the explosion of the explosive charge cannot cause injury or danger, but so that the warning sound emitted from the device may be heard at a considerable distance from the location of the device,-as in an out-building or in unfrequented parts of a large building.

With these and other objects in view, the invention consists in certain novel features of construction as hereinafter set forth and pointed out in the claims.

In the accompanying drawings,

Figure 1 is a view in longitudinal section showing an embodiment of my invention.

Figure 2 is a view in elevation.

Figure 3 is a transverse sectional view on the line 33 of Figure 1, and

Figure 4 is a transverse section on the line fof Figure 1.

The body of the device comprises a tubular member 1 of stout metal tubing exteriorly threaded at its respective ends, as at 2 and 3, for the accommodation of interiorly threaded portions of caps 1 and 5 which close respective ends of the tubular body. Intermediate of its ends (preferably nearer one end than the other), the tubular body 1 is provided with openings 5 which may be diametrically opposite each other, and within the chamber 6 and at one side of said openings, a metal slug 7 is located to take the blow or impact of a metal slug 8, located in the other chamber 9 of the tubular body, when said slug 8 is forced forwardly as the result of an explosion within the chamber 9. The slug 7 will be cushioned by suitable material 10 between said slug and the cap 5. I have found that sawdust provides efficient cushioning material. a

The chamber 9 of the tubular body receives a shell 11 such as employed in fire arms, containing gunpowder and having the usual exploding cap 12, but having no shot nor projectile. The flange 13 of the shell 11 shell.

Serial No. 55,478.

may overlie the end of the tubular body (within the cap 4) and cushioning material 14 (such as sawdust) will preferably be loclatiild between the cap 4 and the head of the s 1e.

Should fire occur at the location of the alarm device, the latter will become so heated that the cap 12 on the shell will be rendered active to explode the powder in the When the shell is thus exploded the slug 8 will be driven forwardly so that it will pass or partially pass the slots 5 in the tubular body and engage the slug 7. The slots 5 will permit emission of sound caused by the explosion and also provide for the escape of products of combustion. All danger of shattering the tubular body is eliminated by the construction and arrangement of the parts employed, and the device is capable of causing a loud alarm or signal which may be heard at a considerable distance.

Slight changes might be made in the details of construction of my invention without departing from the spirit of the latter without limiting its scope and hence I do not wish to restrict myself to the precise details of construction herein set forth.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is:

1. An alarm device comprising a hollow body closed at its ends and forming two chambers, said hollow body having an opening between said chambers, slugs in the respective chambers at respective sides of said opening, and explosive means in one of said chambers behind the slug in the latter.

2. An alarm device comprising a hollow body having a lateral opening and closed at its respective ends, slugs in said hollow body at respective sides of said lateral opening, and an explosive shell in said hollow body behind one of said slugs.

3 An alarm device comprising a hollow body provided between its ends with a lateral opening, caps closing respective ends of said hollow body, slugs within said hollow body at respective sides of said lateral opening, an explosive shell in said hollow body behind one of said slugs, and cushioning material between the other slug and the cap at one end of said hollow body.

a. An alarm device comprising a hollow the other slug, and cushioning material between said shell and the cap on the adjacent end of the hollow body. 10

In testimony whereof, 'I have signed this specification.

VESLEY CLABAUGH BROOKS. 

